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Bug 771775 - (CVE-2011-4576) CVE-2011-4576 openssl: uninitialized SSL 3.0 padding
CVE-2011-4576 openssl: uninitialized SSL 3.0 padding
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20120104,repor...
: Security
Depends On: 773239 773240 773241 773243 773246 773330 773331 846586
Blocks: 771783
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Reported: 2012-01-04 17:38 EST by Vincent Danen
Modified: 2015-11-24 09:46 EST (History)
7 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2012-09-25 03:55:54 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Vincent Danen 2012-01-04 17:38:53 EST
Uninitialized SSL 3.0 Padding (CVE-2011-4576)
=============================================

OpenSSL prior to 1.0.0f and 0.9.8s failed to clear the bytes used as
block cipher padding in SSL 3.0 records. This affects both clients and
servers that accept SSL 3.0 handshakes: those that call SSL_CTX_new with
SSLv3_{server|client}_method or SSLv23_{server|client}_method. It does
not affect TLS.

As a result, in each record, up to 15 bytes of uninitialized memory
may be sent, encrypted, to the SSL peer. This could include sensitive
contents of previously freed memory.

However, in practice, most deployments do not use
SSL_MODE_RELEASE_BUFFERS and therefore have a single write buffer per
connection. That write buffer is partially filled with non-sensitive,
handshake data at the beginning of the connection and, thereafter,
only records which are longer any any previously sent record leak any
non-encrypted data. This, combined with the small number of bytes
leaked per record, serves to limit to severity of this issue.

Thanks to Adam Langley <agl@chromium.org> for identifying and fixing
this issue.

Affected users should upgrade to OpenSSL 1.0.0f or 0.9.8s.

Reference: http://openssl.org/news/secadv_20120104.txt
Comment 1 Vincent Danen 2012-01-04 18:12:29 EST
Seems to be the fix here:

http://cvs.openssl.org/chngview?cn=21940
Comment 2 Fedora Update System 2012-01-11 01:13:12 EST
openssl-1.0.0f-1.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 4 Tomas Hoger 2012-01-11 09:52:04 EST
Created mingw32-openssl tracking bugs for this issue

Affects: fedora-all [bug 773330]
Affects: epel-5 [bug 773331]
Comment 5 Fedora Update System 2012-01-15 15:09:50 EST
openssl-1.0.0f-1.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 6 errata-xmlrpc 2012-01-24 16:05:13 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:0060 https://rhn.redhat.com/errata/RHSA-2012-0060.html
Comment 7 errata-xmlrpc 2012-01-24 16:05:24 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0059 https://rhn.redhat.com/errata/RHSA-2012-0059.html
Comment 8 errata-xmlrpc 2012-02-01 13:56:59 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 4

Via RHSA-2012:0086 https://rhn.redhat.com/errata/RHSA-2012-0086.html
Comment 9 errata-xmlrpc 2012-02-15 11:09:43 EST
This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2012:0109 https://rhn.redhat.com/errata/RHSA-2012-0109.html
Comment 10 errata-xmlrpc 2012-02-21 00:05:48 EST
This issue has been addressed in following products:

  RHEV-H, V2V and Agents for RHEL-5

Via RHSA-2012:0168 https://rhn.redhat.com/errata/RHSA-2012-0168.html
Comment 11 errata-xmlrpc 2012-09-24 12:02:37 EDT
This issue has been addressed in following products:

  JBoss Enterprise Application Platform 6.0.0

Via RHSA-2012:1308 https://rhn.redhat.com/errata/RHSA-2012-1308.html
Comment 12 errata-xmlrpc 2012-09-24 12:03:38 EDT
This issue has been addressed in following products:

  JBoss Enterprise Application Platform 5.1.2

Via RHSA-2012:1307 https://rhn.redhat.com/errata/RHSA-2012-1307.html
Comment 13 errata-xmlrpc 2012-09-24 12:04:47 EDT
This issue has been addressed in following products:

  JBoss Enterprise Web Server 1.0.2

Via RHSA-2012:1306 https://rhn.redhat.com/errata/RHSA-2012-1306.html

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